tools: restore Python 3.14 for daily WPT

Python 3.15 removed CGIHTTPRequestHandler, which WPT pywebsocket3 still
uses. This breaks host configuration in the current undici WPT action.

Signed-off-by: Filip Skokan <panva.ip@gmail.com>
PR-URL: https://github.com/nodejs/node/pull/66699
Reviewed-By: Mike McCready <66998419+MikeMcC399@users.noreply.github.com>
Reviewed-By: Richard Lau <richard.lau@ibm.com>

.github/workflows/daily-wpt-fyi.yml

@@ -13,7 +13,8 @@ on:
     - cron: 30 0 * * *
 
 env:
-  PYTHON_VERSION: '3.15'
+  # WPT's pywebsocket3 still uses CGIHTTPRequestHandler, removed in Python 3.15.
+  PYTHON_VERSION: '3.14'
 
 permissions:
   contents: read